High-efficiency winding for toroid yoke

ABSTRACT

A cathode-ray tube deflection system includes a triad-type cathode-ray tube and a toroid-wound deflection yoke having horizontal and vertical axes with first and second horizontal windings disposed on opposite sides of the vertical axis and first and second vertical windings disposed on opposite sides of the horizontal axis. Each of the vertical windings has a plurality of circumferentially spaced triads of turns with each triad of turn having a pair of first layer turns contiguous to a magnetic core and a second layer turn contacting and supported by a pair of first layer turns and having a diameter greater than either one of the pair of first layer turns.

United States Patent 72] Inventor Charles Edward Torsch Emporium, Pa. [21] Appl. No. 44,922 [22] Filed June 10, 1970 [45] Patented Dec. 28, 1971 [73] Assignee Sylvania Electric Products Inc.

[54] HIGH-EFFICIENCY WINDING FOR TOROID YOKE 15 Claims, 3 Drawing Figs.

[52] U.S. Cl 335/213, 3 1 3/75 [51] Int. Cl H011 5/00 [50] Field of Search .l 335/210, 213; 313/75, 76, 77; 336/229; 315/27 [5 6] References Cited UNITED STATES PATENTS 2,925,542 2/1960 Gethmann 335/213 3,430,099 2/1969 Ashley 3,548,350 12/1970 Archer ABSTRACT: A cathode-ray tube deflection system includes a triad-type cathode-ray tube and a toroid-wound deflection yoke having horizontal and vertical axes with first and second horizontal windings disposed on opposite sides of the vertical axis and first and second vertical windings disposed on opposite sides of the horizontal axis. Each of the vertical windings has a plurality of circumferentially spaced triads of turns with each triad of turn having a pair of first layer turns contiguous to a magnetic core and a second layer turn contacting and supported by a pair of first layer turns and having a diameter greater than either one of the pair of first layer turns,

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INPUT 25 PATENTEUBEE28197I 31531; 533

' sum 1 or a INVENTOR.

CHARLES E. TORSCH ATTORNEY PATENTEDDECZBIQYI 31631533 SHEEI 2 OF 3 I Y HORIZONTAL i INPUT Z5 IN VENT OR. B CHARLES E. TORSCH O ATTOE NEY PATENIEnnEczsmn 3,631,533

SHEET 3 OF 3 HORIZONTAL INPUT INVENTOR. 3 CHARLES E. TORSCH 7 B e WM ATTORNEY HIGH-EFFICIENCY WINDING FOR TOROID YOKE CROSS-REFERENCE TO OTHER APPLICATIONS Copending application entitled Deflection System for Triad-Beam Cathode-Ray Tube filed July 15, 1969 and having Ser. Nos. 841,782; 841,893, and 84l,935 and assigned to the assignee of the present application relate to a toroid yoke structure, fabrication process, and associated circuitry suitable for use with a triad-beam cathode-ray tube deflection system.

BACKGROUND OF THE INVENTION Present-day television receivers employ color cathode-ray tube systems which may be classified into one of two rather general categories. The most common category is the socalled tria technique wherein a color cathode-ray tube employing a plurality of electron guns arranged in a triad cluster is utilized with a saddle-type deflection yoke. The combination serves to effect scanning of a viewing screen by electron beams emanating from the electron guns.

The other well-known category is the in-line technique wherein a plurality of electron guns of a color cathode-ray tube are aligned in a single plane. A toroid-type deflection yoke, designed to accommodate the in-line electron guns, is utilized to effect electron beam scanning of a viewing screen.

Although the triad technique is perhaps the most common method presently employed, it has been found that a system utilizing a saddle" yoke does leave something to be desired. Specifically, the saddle yoke requires a large amount of expensive copper material, is cumbersome and bulky, and is most difficult, if not impossible, to fabricate with symmetry and consistency. Thus, the total system is also lacking in symmetry and consistency.

Also, the in-line" system requires a specific type cathoderay tube as well as an especially designed deflection yoke formed to cooperate with the particular electron gun arrangement. Moreover, the total system requires an electron beam convergence technique or special size correction apparatus entirely foreign and inappropriate to the more common triad system. Thus, the convergence and deflection apparatus required by the in-line system is improper for use with the more popular triad techniques and apparatus.

However, the above-mentioned pending applications, entitled Deflection System For Triad-Beam Cathode-Ray Tube," provide an enhanced technique wherein a toroid-type electron beam deflection yoke is employed with the common and readily available triad-type color cathode-ray tube and associated convergence apparatus. Therein, the deflection yoke includes a core of magnetic material having deflection and vertical axes with first and second horizontal deflection windings toroidally wrapped on the core on opposite sides of the vertical axis and first and second vertical deflection windings toroidally wrapped on the core on opposite sides of the horizontal axis.

Although the above-described apparatus has greatly enhanced the triad technique by reducing cost and complexity and increasing uniformity and repeatability of results, it has been found that certain forms of triad apparatus operate or perform in an improved manner when adjustments to the system are provided. Specifically, it has been found that certain forms of triad apparatus require increased deflection efflciencies especially in the direction of vertical deflection.

One known technique for altering a toroid-wound core is disclosed in U.S. Pat. No. 2,872,652, issued Feb. 3, 1959 to I(.C. Bugg and entitled Coil Construction. Therein a toroidwound core includes a plurality of layers wherein the turns of the layer adjacent the core have a larger diameter than the turns of a second layer supported thereon. Thus, the decreased diameter of the second layer of turns compensates for the decrease in diameter of the core whereupon each layer includes the same number of turns.

Although the above-described toroid-wrapped core may be suitable for use in a transformer or similar apparatus, it is known that a reduction in turn diameter would serve to increase resistance and to decrease efficiency of a deflection yoke. Moreover, increasing the diameter of the turns of an inner layer would be improbable, if not impossible, with the above-described core and winding configuration wherein both layers have essentially the same number of turns.

OBJECTS AND SUMMARY OF THE INVENTION It is an object of the present invention to provide an improved color cathode-ray tube deflection system. Another object of the invention is to provide an enhanced triad deflection system. Still another object of the invention is to provide an improved toroid yoke for television receivers utilizing a triadtype deflection system. A further object of the invention is to provide a toroid deflection yoke having improved deflection efficiency.

These and other objects, advantages and capabilities are achieved in one aspect of the invention by a toroidwound deflection yoke having a core of magnetic material with a horizontal axis and a vertical axis, a pair of horizontal deflec tion windings disposed on opposite sides of the vertical axis, and a pair of vertical deflection windings disposed on opposite sides of the horizontal axis. At least one pair of windings includes a triad of turns with a second layer turn supported by a pair of first layer turns and the second layer turn having a diameter greater than either turn of the pair of first layer turns.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a cross-sectional elevation of a triad-type color cathode-ray tube deflection system; and

FIG. 2 is an end view, as seen by an observer of the viewing screen of a cathode-ray tube, of the toroidal-wound deflection yoke and associated connections to a power source.

FIG. 3 is an end view of a toroidal-wound deflection yoke illustrating horizontal deflection windings having second layer turns of a diameter greater than the first layer turns.

DESCRIPTION OF THE PREFERRED EMBODIMENT For a better understanding of the present invention, together with other and further objects, advantages and capabilities thereof, reference is made to the following disclosure and appended claims in conjunction with the accompanying drawings.

Referring to FIG. I of the drawings, a color cathode-ray tub deflection system of the triad-type includes a color cathoderay tube 5 having a plurality of electron guns 7 and a viewing screen 9 which is impinged by electrons emanating from the electron guns 7. Preferably, the electron guns 7 are in a triad formation and the viewing screen includes red, green, and blue phosphors which are also arrayed in a triad formation.

Associated with the cathode-ray tube 5 is a deflection yoke 11 and a convergence coil 13. The deflection yoke 11 surrounds the neck portion of the cathode-ray tube 5 and is disposed intermediate the electron guns 7 and the viewing screen 9. Also, the convergence coil 13 surrounds the neck portion of the cathode-ray tube 5 and is disposed intermediate the electron guns 7 and the deflection yoke 11.

In operation, the convergence coil 13 serves to alter the electron beams from the electron guns 7 such that the electron beam from each one of the electron guns 7 strike a specific red, green, or blue phosphor arrayed in triad form on the viewing screen 9. The deflection yoke 11 operates on all of the electron beams to effect desired horizontal and vertical scanning of the viewing screen 9.

As to the toroid-wound deflection yoke 11, FIG. 2 illustrates a preferred configuration with some of the structural details eliminated for clarity. Therein, a substantially circular core 15 of magnetic material has a horizontal axis HH and a vertical axis V-V'. A first horizontal deflection winding 17,

represented by black dots, is disposed on the left of the vertical axis VV as seen by an observer of the viewing screen. A second horizontal deflection winding 19, represented by black dots, is disposed on the right or opposite side of the vertical axis VV As can readily be seen, the first and second horizontal deflection windings l7 and 19, in the form of turns of insulated electrical conductors, are preferably in mirror-image relationship with respect to one another about the vertical axis VV'. Also, each one of the first and second horizontal deflection windings 17 and 19 are preferably, not necessarily, substantially symmetrical and in mirror-image relationship with respect to the horizontal axis HH'. Moreover, each one of the first and second horizontal deflection windings l7 and 19 includes a flux-altering means 21 and 23, which may be in the form of a winding gap or short-circuited turns for example, substantially centrally disposed about the horizontal axis H H.

Also, each one of the first and second horizontal deflection windings 17 and 19 is in the form of an intermittent bank winding. The intermittent bank winding includes a plurality of circumferentially spaced triad windings each having a second layer turn contacting and supported by a pair of first layer turns.

As to the bank winding, all of the turns of each of the triad windings are electrically connected in series whereby the potential difference between turns is a minimum. Thus, a horizontal input signal, appearing at a horizontal terminal 25, applied to the second or right horizontal deflection winding 19 progress counterclockwise from bottom to top, through a shorter jumper 27, and from top to bottom of the first or left horizontal deflection winding 17 to a potential reference level or circuit ground.

Further, first and second vertical deflection windings 29 and 31, in the form of turns of insulated electrical conductors and represented by white dots and including a plurality of circumferentially spaced triads, are interleaved with the first and second horizontal deflection windings 17 and 19. These first and second vertical deflection windings 29 and 31 are also preferably in mirror-image relationship with respect to one another about the horizontal axis HH. Also, each one of the first and second vertical deflection windings 29 and 31 is preferably symmetrically centered and in mirror-image relationship about the vertical axis VV'. Moreover, each one of the first and second vertical deflection windings 29 and 31 has a flux altering means 33 and 35 centrally disposed with respect thereto and to the vertical axis VV'.

Additionally, each one of the circumferentially spaced triads of the first and second vertical deflection windings 29 and 31 includes a first layer in the form of a pair of turns 37 contiguous with the circular magnetic core and a second layer in the form of a single turn 39 contacting and supported by the pair of turns 37. This single turn 39 of the second layer of turns includes an electrical conductor surrounded by electrical insulating material and the conductor and insulator materials combine to provide a diameter greater than the diameter of any one of the supporting pair of turns 37.

The single turn 39 of the second layer of turns is of a diameter at least equal to and preferably larger than the diameter of the electrical conductor of any one of the supporting pair of turns 37. in this manner, the increased conductor size of the single turn 39 serves to decrease the resistance of the vertical windings 29 and 31. Since the resistance is inversely related to the efficiency of the windings 29 and 31, reduced resistance provides a desired increased efficiency of the vertical deflection windings 29 and 31.

Also, the increased diameter of the single turn 39 may be achieved by increasing the electrical insulation rather than the electrical conducting materials. Thus, the triad-type winding configuration permits either increased insulating capability or a reduction in resistance without alteration in the winding configuration.

As to the sawtooth-type winding, the electrical potential intermediate each of the single turns 39 and the supporting pair of turns 37 is substantially constant. More specifically, a vertical input signal source 41 is coupled to the single turn 39 at one end of the second vertical deflection winding'31. The single turn 39 at the opposite end of the second vertical deflection winding 31 is coupled back by an external conductor 43 to the pair of turns 37 of the first layer of turns at one end of the second vertical deflection winding 31. The pair of turns 37 at the opposite end of the first layer of turns is coupled by an external jumper 45 to the pair of turns 37 of the first vertical deflection winding 29. The pair of turns 37 at the opposite end of the first vertical deflection winding 29 is coupled back by a conductor 47 to the single turn 39 of the second layer of turns. The single turn 39 at the opposite end of the first vertical deflection winding 29 is coupled to a potential reference level or circuit ground. Thus, the potential intermediate of the pair of turns 37 and the single turn 39 of any triad group in the vertical deflection windings 27 and 31 is substantially the same.

Further, FIG, 3 illustrates a toroid-wound deflection yoke wherein horizontal deflection windings 18 and 20, represented by blackened dots, includes a first layer of turns 38 contiguous to a magnetic core 15 and a second layer of turns 40 in contact therewith. The first layer of turns 38 has insulator-covered wire turns of a given diameter and the second layer of turns 40 has insulator-covered turns of a diameter greater than the given diameter of the first layer of turns 38.

As to fabrication of a toroidal wound deflection yoke, the pair of turns 37 of each of the vertical deflection windings 29 and 31 are circumferentially spaced and toroidally wound on the substantially circular core 15 of magnetic material by advancement in opposite directions as indicated by the arrows of FIG. 2. Then, the first and second horizontal deflection windings 17 and 19 are circumferentially interleaved intermediate the vertical deflection windings 29 and 31. These horizontal deflection windings 17 and 19 are of a bank-wound form wherein the turns of each triad are series connected and all turns of the triad are applied at one timev Moreover, the vertical deflection windings 29 and 31 inhibit undesired spreading and distortion of the bank-wound horizontal windings 17 and 19 upon application of the second layer of turns thereto. Also, the horizontal deflection windings 17 and 19 are applied by advancement in opposite directions as indicated by the arrows of FIG. 2.

Thus, there has been provided a unique deflection yoke especially suitable for use in a color television receiver employing a triad-type color cathode-ray tube. The deflection yoke is of the toroid type wherein first and second horizontal deflection windings and first and second vertical deflection windings are in the form of circumferentially spaced and interleaved triads of turns. Also, the triads of turns of the vertical deflection windings include a second layer turn supported by a pair of first layer turns wherein the diameter of the second layer turn is greater than the diameter of any one turn of the pair of first layer turns. in this manner, the triad winding configuration permits either increased conductor or increased insulation diameter of a second layer of turns whereby either resistance properties are desirably reduced or electrical insulation properties are desirably increased without undesired alterations in the winding configurations.

While the there has been shown and described what is at present considered the preferred embodiments of the invention, it will be obvious to those skilled in the art that various changes and modifications may be made therein without departing from the invention as defined by the appended claims.

lclaim:

1. in a color cathode-ray tube employing a triad electron gun arrangement, a deflection yoke comprising in combination:

a toroid core of magnetic material having a horizontal axis and a vertical axis;

first and second horizontal deflection windings wrapped about said core on opposite sides of said vertical axis,

each of said windings including a plurality of circumferentially spaced turns with a second layer turn contacting and supported by a pair of first layer turns contiguous with the core; and

first and second vertical deflection windings wrapped about said core on opposite sides of said horizontal axis, each of said windings including a plurality of circumferentially spaced turns including a pair of first layer turns contiguous with the core and a second layer turn contacting and supported by said pair of first layer turns and of a diameter greater than the diameter of either one of said pair of first layer turns.

2. The combination of claim 1 wherein said diameter of said second layer turn includes a combination of insulation and conduction materials.

3. The combination of claim 1 wherein each of said turns of said first and second layers includes a conductor and said diameter of said conductor of said second layer turn of said first and second vertical deflection windings is greater than said diameter of said conductor of either turn of said pair of first layer turns.

4. The combination of claim 1 wherein each of said first and second horizontal deflection windings includes a flux-altering means substantially symmetrical to said horizontal axis.

5. The combination of claim 1 wherein each of said first and second vertical deflection windings includes a flux-altering means substantially symmetrical to said vertical axis.

6. The combination of claim 1 wherein said first and second horizontal deflection windings are disposed on opposite sides of said vertical axis and in mirror-image relationship to one another;

7. The combination of claim 1 wherein said first and second vertical deflection windings are disposed on opposite sides of said horizontal axis in mirror-image relationship to one another.

8. The combination of claim 1 wherein said second layer turn of said turns of said first and second horizontal deflection windings has a diameter grater than the diameter of each turn of said pair of turns of said first layer turns.

9. The combination of claim 1 wherein said first and second vertical deflection windings are disposed in mirror-image relationship on opposite sides of said horizontal axis and each of said first and second vertical deflection windings is disposed in mirror-image relationship on opposite sides of said vertical axis.

10. A toroid-wound deflection yoke for a color cathode-ray tube having a plurality of electron guns arrayed in the form of a triad comprising in combination:

a substantially circular core or magnetic material having horizontal and vertical axes;

first and second horizontal deflection windings oppositely disposed on said core about said vertical axis, said windings each including a plurality of circumferentially spaced triads of turns with each triad having a pair of turns contiguous to the core and a turn contacting and supported by the pair of turns; and

first and second vertical deflection windings oppositely disposed on said core about said horizontal axis, said windings each including a plurality of circumferentially spaced triads of turns interleaved with said first and second horizontal deflection windings and each triad having a pair of turns contiguous to the core and a turn of a diameter greater than the diameter of either one of said pair of turns contacting and supported by said pair of turns.

11. The combination of claim 10 wherein said turn supported by said pair of turns includes a combination of electrical conducting and electrical insulating materials.

12. The combination of claim 10 wherein said turn supported by said pair of turns includes an electrical conducting material of a diameter greater than the diameter of the conductor of either one of said airpf turns.

13. The combination 0 claim 10 wherein said turn supported by said pair of turns of said first and second horizontal deflection windings is of a diameter greater than the diameter of either one of said pair of turns.

14. The combination of claim 10 wherein said first and second horizontal deflection windings and said first and second vertical deflection windings each include a flux-altering means substantially centrally disposed about said horizontal and vertical axis respectively.

15. The combination of claim 10 wherein said first and second horizontal deflection windings are in mirror-image relationship to one another about said vertical axis and said first and second vertical deflection windings are in mirrorimage relationship to one another about said horizontal axis.

I UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent'No. 3 ,631,533 Dated December 28, 1971 Inventor) Charles Edward Torsch It is certified that error appears in the aboveidentified patent and that said Letters Patent are hereby corrected as shown below:

Col. 1, line 52 of the specification "deflection" should read "horizontal" Col. 2, line 49 of the specification "tub" should read "tube" Col. 5, line 39 of Claim 8, "grater" should read "greater" Signed and sealed this 11th day of July 1972.

(SEAL) Attest: v

EDWARD M .FLETCHER, JR ROBERT GOTTSCHALK Attesting Officer Commissioner of Patents 3 3 3 I UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent'No. 3,631,533 Dated December 28, 1971 7 Inventor-(s) CharleS TOI'SCh 7 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Col. 1, line 52 of the specification "deflection" should read "horizontal" Col. 2, line 49 of the specification "tub" should read "tube" Col. 5, line 39 of Claim 8, "grater" should read "greater" Signed and sealed this 11th day of July 1972.

(SEAL) Attest:

EDWARD M.FLETCHER,JR. ROBERT GOTTSCHALK Attesting Officer Commissioner of Patents 

1. In a color cathode-ray tube employing a triad electron gun arrangement, a deflection yoke comprising in combination: a toroid core of magnetic material having a horizontal axis and a vertical axis; first and second horizontal deflection windings wrapped about said core on opposite sides of said vertical axis, each of said windings including a plurality of circumferentially spaced turns with a second layer turn contacting and supported by a pair of first layer turns contiguous with the core; and first and second vertical deflection windings wrapped about said core on opposite sides of said horizontal axis, each of said windings including a plurality of circumferentially spaced turns including a pair of first layer turns contiguous with the core and a second layer turn contacting and supported by said pair of first layer turns and of a diameter greater than the diameter of either one of said pair of first layer turns.
 2. The combination of claim 1 wherein said diameter of said second layer turn includes a combination of insulation and conduction materials.
 3. The combination of claim 1 wherein each of said turns of said first and second layers includes a conductor and said diameter of said conductor of said second layer turn of said first and second vertical deflection windings is greater than said diameter of said conductor of either turn of said pair of first layer turns.
 4. The combination of claim 1 wherein each of said first and second horizontal deflection windings includes a flux-altering means substantially symmetrical to said horizontal axis.
 5. The combination of claim 1 wherein each of said first and second vertical deflection windings includes a flux-altering means substantially symmetrical to said vertical axis.
 6. The combination of claim 1 wherein said first and second horizontal deflection windings are disposed on opposite sides of said vertical axis and in mirror-image relationship to one another.
 7. The combination of claim 1 wherein said first and second vertical deflection windings are disposed on opposite sides of said horizontal axis in mirror-image relationship to one another.
 8. The combination of claim 1 wherein said second layer turn of said turns of said first and second horizontal deflection windings has a diameter grater than the diameter of each turn of said pair of turns of said first layer turns.
 9. The combination of claim 1 wherein said first and second vertical deflection windings are disposed in mirror-image relationship on opposite sides of said horizontal axis and each of said first and second vertical deflection windings is disposed in mirror-image relationship on opposite sides of said vertical axis.
 10. A toroid-wound deflection yoke for a color cathode-ray tUbe having a plurality of electron guns arrayed in the form of a triad comprising in combination: a substantially circular core or magnetic material having horizontal and vertical axes; first and second horizontal deflection windings oppositely disposed on said core about said vertical axis, said windings each including a plurality of circumferentially spaced triads of turns with each triad having a pair of turns contiguous to the core and a turn contacting and supported by the pair of turns; and first and second vertical deflection windings oppositely disposed on said core about said horizontal axis, said windings each including a plurality of circumferentially spaced triads of turns interleaved with said first and second horizontal deflection windings and each triad having a pair of turns contiguous to the core and a turn of a diameter greater than the diameter of either one of said pair of turns contacting and supported by said pair of turns.
 11. The combination of claim 10 wherein said turn supported by said pair of turns includes a combination of electrical conducting and electrical insulating materials.
 12. The combination of claim 10 wherein said turn supported by said pair of turns includes an electrical conducting material of a diameter greater than the diameter of the conductor of either one of said pair of turns.
 13. The combination of claim 10 wherein said turn supported by said pair of turns of said first and second horizontal deflection windings is of a diameter greater than the diameter of either one of said pair of turns.
 14. The combination of claim 10 wherein said first and second horizontal deflection windings and said first and second vertical deflection windings each include a flux-altering means substantially centrally disposed about said horizontal and vertical axis respectively.
 15. The combination of claim 10 wherein said first and second horizontal deflection windings are in mirror-image relationship to one another about said vertical axis and said first and second vertical deflection windings are in mirror-image relationship to one another about said horizontal axis. 